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/*
* libjingle
* Copyright 2012, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef TALK_APP_WEBRTC_DATACHANNEL_H_
#define TALK_APP_WEBRTC_DATACHANNEL_H_
#include <string>
#include <queue>
#include "talk/app/webrtc/datachannelinterface.h"
#include "talk/app/webrtc/proxy.h"
#include "talk/base/messagehandler.h"
#include "talk/base/scoped_ref_ptr.h"
#include "talk/base/sigslot.h"
#include "talk/media/base/mediachannel.h"
#include "talk/session/media/channel.h"
namespace webrtc {
class DataChannel;
class DataChannelProviderInterface {
public:
// Sends the data to the transport.
virtual bool SendData(const cricket::SendDataParams& params,
const talk_base::Buffer& payload,
cricket::SendDataResult* result) = 0;
// Connects to the transport signals.
virtual bool ConnectDataChannel(DataChannel* data_channel) = 0;
// Disconnects from the transport signals.
virtual void DisconnectDataChannel(DataChannel* data_channel) = 0;
// Adds the data channel SID to the transport for SCTP.
virtual void AddSctpDataStream(uint32 sid) = 0;
// Removes the data channel SID from the transport for SCTP.
virtual void RemoveSctpDataStream(uint32 sid) = 0;
// Returns true if the transport channel is ready to send data.
virtual bool ReadyToSendData() const = 0;
protected:
virtual ~DataChannelProviderInterface() {}
};
// DataChannel is a an implementation of the DataChannelInterface based on
// libjingle's data engine. It provides an implementation of unreliable or
// reliabledata channels. Currently this class is specifically designed to use
// both RtpDataEngine and SctpDataEngine.
// DataChannel states:
// kConnecting: The channel has been created the transport might not yet be
// ready.
// kOpen: The channel have a local SSRC set by a call to UpdateSendSsrc
// and a remote SSRC set by call to UpdateReceiveSsrc and the transport
// has been writable once.
// kClosing: DataChannelInterface::Close has been called or UpdateReceiveSsrc
// has been called with SSRC==0
// kClosed: Both UpdateReceiveSsrc and UpdateSendSsrc has been called with
// SSRC==0.
class DataChannel : public DataChannelInterface,
public sigslot::has_slots<>,
public talk_base::MessageHandler {
public:
static talk_base::scoped_refptr<DataChannel> Create(
DataChannelProviderInterface* provider,
cricket::DataChannelType dct,
const std::string& label,
const DataChannelInit* config);
virtual void RegisterObserver(DataChannelObserver* observer);
virtual void UnregisterObserver();
virtual std::string label() const { return label_; }
virtual bool reliable() const;
virtual bool ordered() const { return config_.ordered; }
virtual uint16 maxRetransmitTime() const {
return config_.maxRetransmitTime;
}
virtual uint16 maxRetransmits() const {
return config_.maxRetransmits;
}
virtual std::string protocol() const { return config_.protocol; }
virtual bool negotiated() const { return config_.negotiated; }
virtual int id() const { return config_.id; }
virtual uint64 buffered_amount() const;
virtual void Close();
virtual DataState state() const { return state_; }
virtual bool Send(const DataBuffer& buffer);
// talk_base::MessageHandler override.
virtual void OnMessage(talk_base::Message* msg);
// Called if the underlying data engine is closing.
void OnDataEngineClose();
// Called when the channel's ready to use. That can happen when the
// underlying DataMediaChannel becomes ready, or when this channel is a new
// stream on an existing DataMediaChannel, and we've finished negotiation.
void OnChannelReady(bool writable);
// Sigslots from cricket::DataChannel
void OnDataReceived(cricket::DataChannel* channel,
const cricket::ReceiveDataParams& params,
const talk_base::Buffer& payload);
// The remote peer request that this channel should be closed.
void RemotePeerRequestClose();
// The following methods are for SCTP only.
// Sets the SCTP sid and adds to transport layer if not set yet.
void SetSctpSid(int sid);
// Called when the transport channel is created.
void OnTransportChannelCreated();
// The following methods are for RTP only.
// Set the SSRC this channel should use to send data on the
// underlying data engine. |send_ssrc| == 0 means that the channel is no
// longer part of the session negotiation.
void SetSendSsrc(uint32 send_ssrc);
// Set the SSRC this channel should use to receive data from the
// underlying data engine.
void SetReceiveSsrc(uint32 receive_ssrc);
cricket::DataChannelType data_channel_type() const {
return data_channel_type_;
}
protected:
DataChannel(DataChannelProviderInterface* client,
cricket::DataChannelType dct,
const std::string& label);
virtual ~DataChannel();
private:
bool Init(const DataChannelInit* config);
void DoClose();
void UpdateState();
void SetState(DataState state);
void DisconnectFromTransport();
void DeliverQueuedControlData();
void QueueControl(const talk_base::Buffer* buffer);
void ClearQueuedControlData();
void DeliverQueuedReceivedData();
void ClearQueuedReceivedData();
void DeliverQueuedSendData();
void ClearQueuedSendData();
bool InternalSendWithoutQueueing(const DataBuffer& buffer,
cricket::SendDataResult* send_result);
bool QueueSendData(const DataBuffer& buffer);
bool SendOpenMessage(const talk_base::Buffer* buffer);
std::string label_;
DataChannelInit config_;
DataChannelObserver* observer_;
DataState state_;
bool was_ever_writable_;
bool connected_to_provider_;
cricket::DataChannelType data_channel_type_;
DataChannelProviderInterface* provider_;
bool send_ssrc_set_;
uint32 send_ssrc_;
bool receive_ssrc_set_;
uint32 receive_ssrc_;
// Control messages that always have to get sent out before any queued
// data.
std::queue<const talk_base::Buffer*> queued_control_data_;
std::queue<DataBuffer*> queued_received_data_;
std::deque<DataBuffer*> queued_send_data_;
};
class DataChannelFactory {
public:
virtual talk_base::scoped_refptr<DataChannel> CreateDataChannel(
const std::string& label,
const DataChannelInit* config) = 0;
protected:
virtual ~DataChannelFactory() {}
};
// Define proxy for DataChannelInterface.
BEGIN_PROXY_MAP(DataChannel)
PROXY_METHOD1(void, RegisterObserver, DataChannelObserver*)
PROXY_METHOD0(void, UnregisterObserver)
PROXY_CONSTMETHOD0(std::string, label)
PROXY_CONSTMETHOD0(bool, reliable)
PROXY_CONSTMETHOD0(bool, ordered)
PROXY_CONSTMETHOD0(uint16, maxRetransmitTime)
PROXY_CONSTMETHOD0(uint16, maxRetransmits)
PROXY_CONSTMETHOD0(std::string, protocol)
PROXY_CONSTMETHOD0(bool, negotiated)
PROXY_CONSTMETHOD0(int, id)
PROXY_CONSTMETHOD0(DataState, state)
PROXY_CONSTMETHOD0(uint64, buffered_amount)
PROXY_METHOD0(void, Close)
PROXY_METHOD1(bool, Send, const DataBuffer&)
END_PROXY()
} // namespace webrtc
#endif // TALK_APP_WEBRTC_DATACHANNEL_H_
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